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Segmentation fault on Community Cloud — even happens with the default/starter template, not just my app

calendar_today July 13, 2026 person @lukasmasuch Lukas Masuch domain streamlit

This is most likely be caused by a bug in pyarrow 25.0.0: [C++][Python] SIGSEGV in bundled mimalloc mi_thread_init when libarrow is first loaded on a non-main thread that exits (mimalloc 3.3.x, pyarrow 25.0.0) · Issue #50471 · apache/arrow · GitHub Please make sure to update to Streamlit 1.59.2 or pin pyarrow

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